请教大家一个小程序
此程序计算信号傅立叶系数，最后一个for循环我看不懂，请高人帮我注释一下啊？function xx=fseries(funfcn,a,b,n,tol,p1,p2,p3)
%FSERIES Returns the Fourier series coefficients.
% XX=FSERIES(FUNFCN,A,B,N,TOL,P1,P2,P3)
% funfcn=the given function, in an m-file.
% It can depend on up to three parameters
% p1,p2, and p3. The function is given
% over one period extending from 'a' to 'b'
% xx=vector of length n+1 of Fourier Series
% Coefficients, xx0,xx1,...,xxn.
% p1,p2,p3=parameters of funfcn.
% tol=the error level.
j=sqrt(-1);
args0=[];
for nn=1:nargin-5
args0=;
end
args=;
t=b-a;
xx(1)=eval(['1/(',num2str(t),').*quad(funfcn,a,b,tol,[]',args]) ;
for i=1:n
new_fun = 'exp_fnct' ;
args=[',', num2str(i), ',', num2str(t), args0, ')' ] ;
xx(i+1)=eval(['1/(',num2str(t),').*quad(new_fun,a,b,tol,[],funfcn',args]);
end:(
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